package com.roy.util;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.imageio.ImageIO;
import javax.imageio.stream.ImageOutputStream;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.util.Random;

/**
 * @author ：楼兰
 * @date ：Created in 2021/1/14
 * @description:
 **/

public class ImageUtil {
    private Logger logger = LoggerFactory.getLogger(ImageUtil.class);
    private ByteArrayInputStream image;//图像

    private String str;//验证码
    private int width = 352;
    private int height = 46;

    private ImageUtil() {
        init();//初始化属性
    }

    public static ImageUtil Instance() {
        return new ImageUtil();
    }

    /*
     * 取得验证码图片
     */
    public ByteArrayInputStream getImage() {
        return this.image;
    }

    /*
     * 取得图片的验证码
     */
    public String getString() {
        return this.str;
    }

    private void init() {
        this.str = "";
        //       在内存中创建图象
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        //       获取图形上下文
        Graphics g = image.getGraphics();
        //      生成随机类
        Random random = new Random();
        //       设定背景色
        g.setColor(getRandColor(200, 250));
        g.fillRect(0, 0, width, height);
        //      设定字体
        g.setFont(new Font("Times New Roman", Font.PLAIN, 18));
        //       随机产生155条干扰线，使图象中的认证码不易被其它程序探测到
        g.setColor(getRandColor(160, 200));
        for (int i = 0; i < 155; i++) {
            int x = random.nextInt(width);
            int y = random.nextInt(height);
            int xl = random.nextInt(12);
            int yl = random.nextInt(12);
            g.drawLine(x, y, x + xl, y + yl);
        }
        //       取随机产生的认证码(6位数字)
//        String sRand = "";
//        for (int i = 0; i < 6; i++) {
//            String rand = String.valueOf(random.nextInt(10));
//            sRand += rand;
//            // 将认证码显示到图象中
//            g.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110)));
//            //      调用函数出来的颜色相同，可能是因为种子太接近，所以只能直接生成
//            g.drawString(rand, (width/6) * i + 6, 46);
//            this.str += rand;/*   赋值验证码   */
//        }
        int num1 = random.nextInt(10);
        int num2 = random.nextInt(10);
        g.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110)));
        g.drawString(String.valueOf(num1),(width/5)*0+6,36);
        g.drawString("+",(width/5)*1+6,36);
        g.drawString(String.valueOf(num2),(width/5)*2+6,36);
        g.drawString("=",(width/5)*3+6,36);
        g.drawString("?",(width/5)*4+6,36);

        this.str = ""+(num1+num2);


        //       图象生效
        g.dispose();
        ByteArrayInputStream input = null;
        ByteArrayOutputStream output = new ByteArrayOutputStream();
        try {
            ImageOutputStream imageOut = ImageIO.createImageOutputStream(output);
            ImageIO.write(image, "JPEG", imageOut);
            imageOut.close();
            input = new ByteArrayInputStream(output.toByteArray());
        } catch (Exception e) {
            System.out.println("验证码图片产生出现错误：" + e.toString());
        }

        this.image = input;/*  赋值图像  */
    }

    /*
     * 给定范围获得随机颜色
     */
    private Color getRandColor(int fc, int bc) {
        Random random = new Random();
        if (fc > 255) fc = 255;
        if (bc > 255) bc = 255;
        int r = fc + random.nextInt(bc - fc);
        int g = fc + random.nextInt(bc - fc);
        int b = fc + random.nextInt(bc - fc);
        return new Color(r, g, b);
    }
}
